This week, Google made a change to how it loads images in your email. Now, instead of pulling images from the source, Google caches the pictures on its own servers. That's great if you want the pictures, but if not, you can turn it off.

While Ars Technica points out that this move inadvertently makes it more difficult for marketers to get data about you, they still take up bandwidth. If you're on a metered connection (or just don't want images enabled by default), you can disable them in your Settings here. The privacy minded will also note that the nature of this feature means that Google makes a copy of every image it shows you, so if you're in that rare group of people who share links to sensitive information you don't want Google storing away, you should probably turn this feature off.